CNET checked out this DVD burner from Plextor, here's a clip from their review:

If you're looking for an external burner with excellent all-around performance, Plextor's PX-740UF is an attractive, albeit pricey, option. It garnered top-flight scores in nearly all our ripping, burning, and rewriting tests. It also offers FireWire and USB 2.0 connectivity, though Mac users may bemoan the lack of software for their platform. Still, the PX-740UF is worth consideration by Apple users who have their own software (such as Roxio Toast Titanium 7) or can live with OS X's native disc-burning tools.



Link: CNET